X c collet chuck



F. W. IGGBERG.

COLLET CHUCK.

Patented Jam N, 1922.,

PATNT ti'ltlf.

y UNITED smits FREDERICK W. IGGBERG, 01T LOG.iNEnlLGl:`tT, INDJLANA, tO LJTIthTSPORT MACHINE COMPANY, Oli' IAOGANEKRT, l'hiivihli.

COLLET GHUCK.

Application filed March 3, 1.9.1.9.

To all wlw/m. t may zzo/noem.'

13e it known that l, Fnnnnniok W. leccano, a subject `oi? the `King oit Sweden, residing at Logansport, in the county et Cass and State of Indiana, have invented certain new and uselul Improvements in Collet Chucks oi? which the following is a specitication.

This invention relates to chucks adapted for gripping and holding work pieces, and is especially applicable to chucks ot this character which are manipulated by air or liuid pressure. In chucks ot this character such as are now in use, the movement ci the collet or jaw actuating portions is usually such that the jaws are slightly tipped, so that they do not have a parallel movement when they engage the article to be gripped.

One ot the principal objects of the present invention is to provide a chuck in which the collet members are actuated so that the jaws will move in parallelism or in planes parallel to the axis ont the chuck; another object is to provide a chuck having compara tively few parts, with the parts so. designed that the chuck may be economically7 made; another object is to provide a chuck which will be particularly efiicient and durable in operation; and other objects will appear from the following description.

In the accompanying drawings illustrating this invention:

Figure l is a longitudinal sectional viewj Figure 2 is an end view; and

Figure 3 is a cross section talccn on line SW3 of Fig. 1.

As shown in these drawings, irepresents the chuck body or housing, which is preierably oi cylindrical form, and has a conical or tapered chamber or opening at the iront end. The inner surface of the conical opening may be continuous throughout, but l prefer to have the central portion cut away so as to provide tapered seats 6 and Y the front and rear portions of the opening. The collet 8 may consist of any number ot' segments 9, which serve as jaws or jaw supporting members. The outer surface ot the collet is made in a substantially conical form or tapered so as to correspond with the taper of the head or body portion t, with which it engages.

The outer surface ot the collet may also be continuous, but I prefer to have it cut away at the central part so as to itorm engaging seats 10 and 1i, at the iront and rear ends Specification of Letters Patent.

Patented dan. it?, l

serial no. staar?.

thereof, which seats engage with the seats G and 7 in the body portion. lthe seats G and i' are ci the same taper, so that the collet jaws 9 will move :in parallelism as 'the j aws slide back and itorth on these seats. .lfn other words, the :iront and rear ends out the jaws will move radially the same distance during the longitudinal movement. Tlcse jaws are preterably held in circumferential position in the housing i by means oi studs 1Q, the inner ends of which engage with slots 13 in the jaws 9. rlhe front ends oit the jaws are urged apart or to open position by means of an annular spring 11i, which rests in an inner circumferential groove 15.

The collet is moved back and forth by means ot a draw stud or bolt 16, which carries a disc 17 which is adapted to engage with the rear ends 18 ot the jaws, topress them forwardly or to open position. The bolt 16 has a head 19, which is tapered on the under side as indicated at 20, for engagement with the correspondingly tapered faces 21 on the inwardly extending portions of the ends 18. This taper permits the radial movement ot the rear ends while at the same time serving to urge the inner ends outwardly to hold the engaging portions 11 of the collet jaws against the seat 7.

The inner faces ot the jaws may be vformed in any suitable manner for engagement with the work pieces, but l prefer to provide removable segments or auxiliary jaw members 22, which are held in the jaws 9 by means oiscrews 23. These replaceable jaw members may be made to :tit diiierent kinds ot work pieces and may be readily changed or renewed.

l' also provide a stop 2li, which is held in position by screws 25 passing through the body or housing 9A: and through suitable slots in the collet. This stop serves as a guide for the stock or material which is to be held in the chuck.

It will be noted that the chuck may be made in various sizes and forms for different work, and the parts may be changed without departing from the scope ot this invention.

Having thus described my invention, what I claim is:

1. A. collet chuck comprising a housing, having a tapered seat in the end thereof, a collet composed of a plurality ot jaws mounted in said seat and having its outer surface tapered. to engage with the seat, said jaws having` inwardly extending projections at their rear ends with tapered front faces, a draw bolt having a tapered head engaging with the 'front faces of said projections, and a disc carried by said bolt and slidably mounted in the housing, said disc being adapted to engage with the rear faces of said projections.

2. The combination of a housing having a central cylindrical bore, and having an annular longitudinally tapered seat in the front end thereof, a collet composed of a plurality of jaws, mounted in said recess, and'having its outer surface tapered to engage with said seat, said jaws having inwardly extending projections at their rear ends, a draw bolt having a head engaging with the front faces oi said projections, a disc carried by said bolt and slidably mounted in the bore of the housing, said disc being adapted to engage with the rear faces of said projections, an annular spring itting ina groove in the jaws and tending to force the jaws outwardly, auxiliary jaw members secured in said collet jaws and covering said groove, a stop mounted in said collet, and screws engaging with said housing and stop for holding the stop, said stop being adapted to be engaged by the irst named screw head for limiting the movement of the collet.

FREDERICK lV. IGGBERG. 

